Hello all,
A customer ask,
" We are using multiple AFE5851 frontends on custom digitizer boards for a scientific experiment.
The input signals have 25 Ohms source impedance and are connected DC-coupled (centered around the common-mode) to the AFE5851 chips. We are experiencing a high crosstalk in the low frequency region. When a 10kHz rectangular stimulus is applied to channel 1 ("hsADC1c1") while measuring channel 9 ("hsADC1c9"), crosstalk effects at 1% of the stimulus amplitude are observed. If the stimulus is applied to a channel routed at the same PCB-internal distance, but to another AFE5851 chip ("hsADC2c1"), this effect is not observed. Thus crosstalk effects external to the AFE5851 are unlikely to cause this effect. A plot of the crosstalk is attached
.xtalk_tx.pdf
The datasheet does not state any information about this. Is this behavior expected, or do we possibly have a faulty circuit leading to this effect? "
Could anyone help me with this?
Thank you in advance.